How does one tell what thread is needed on the track rod end with out taking the old one off first?

I need a passenger side TRE for my 86 110.
 
You could try and follow whats left of the visible thread, but really youi cant tell for sure,
 
So if the rod is correct there should be a conventional right thread on the passenger side and a left thread on the drivers side?
 
So if the rod is correct there should be a conventional right thread on the passenger side and a left thread on the drivers side?

Maybe......what state is the other in? It could be worth replacing both, and then they're done. That way you'll need one of each
 
RTC5870 - left hand thread, RTC5869 - right hand thread (drivers side). According to my 1987 parts manual.
 

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